Bigfoot (also known as Sasquatch) is a large, bipedal cryptid reported across forested regions of North America, most frequently in the Pacific Northwest. Field observation records dating to the early 20th century describe a heavily built, hirsute figure standing between seven and ten feet tall. Reported sightings number in the thousands, with the highest concentration documented in Washington, Oregon, and British Columbia.
**1. Estimated Dimensions**
Based on stride analysis of the 1967 Patterson-Gimlin trackway near Bluff Creek, California, biomechanics researchers at the University of Minnesota estimated a standing height of between 7 feet 2 inches and 8 feet 11 inches, depending on assumed limb proportions. Foot impressions recovered from the site measured 14.5 inches in length and 7 inches in width, consistent with earlier plaster casts taken by journalist John Green in Bluff Creek in 1958. A 2002 re-examination of the site by the North American Primate Research Consortium found no additional impressions but confirmed the original cast dimensions.
**2. Ape Canyon and the 1924 Incident**
The earliest detailed encounter in the documented record occurred in July 1924 at Ape Canyon, Washington, on the eastern slopes of Mount St. Helens. A party of miners reported a sustained overnight assault on their cabin by several large bipedal figures, with displaced boulders and a damaged roof noted in the subsequent Forest Service inspection report. The incident was catalogued by the U.S. Geological Survey's Pacific Northwest Field Office as Case No. 1924-APE-7 and cross-referenced in Frederick Ape's regional geological survey of the area the following year. A full account of the event is available at [/wiki/ape-canyon](/wiki/ape-canyon).
**3. Hair and Tissue Sample Analysis**
Between 1976 and 2014, the North American Wildlife Research Station in Medford, Oregon, received and catalogued 139 hair samples attributed to Bigfoot by submitting parties. Of these, 127 were identified by mitochondrial DNA analysis as originating from known species — including black bear, elk, coyote, and domestic dog. The remaining 12 samples produced degraded or inconclusive results. A 2014 study published in *Proceedings of the Royal Society B* by geneticist Bryan Sykes of the University of Oxford examined 36 hair samples across North America and confirmed no novel primate DNA, though two samples from the Cascade Range returned sequences consistent with an unclassified bear population.
**4. Acoustic Documentation**
The Sierra Sounds recordings, captured by researchers Ronald Morehead and Alan Berry in the Sierra Nevada mountains of California between 1971 and 1975, remain among the most analysed audio samples in cryptozoological literature. Linguistic analysis conducted in 1978 by R. Lynn Kirlin and Lasse Hertel at the University of Wyoming concluded that the vocalizations displayed frequency modulations consistent with a larynx significantly larger than that of any known human speaker. The recordings are archived at the Bigfoot Field Researchers Organization (BFRO) and the Borges Acoustic Research Library in Sacramento, California.
**5. Population Modelling**
A 2009 habitat modelling study conducted by wildlife ecologists at Idaho State University, using GIS-layered old-growth forest coverage, reported game-trail density, and historical sighting coordinates from the BFRO database, estimated that the Pacific Northwest could theoretically sustain a breeding population of between 300 and 500 large omnivores of undocumented species — contingent on caloric range estimates derived from grizzly bear metabolism. The study, published in the *Journal of Biogeography*, did not conclude that Bigfoot exists, but noted that the region's carrying capacity had not been a limiting factor in prior objections to the hypothesis. A related discussion of the Ape Canyon ecosystem appears at [/wiki/sasquatch-massacre](/wiki/sasquatch-massacre).
**6. Cultural and Legal Recognition**
Skamania County, Washington, passed Ordinance No. 69-01 in April 1969, making it a felony to kill a Bigfoot within county limits — later amended in 1984 to a misdemeanour. The ordinance cited "the possible existence of undiscovered anthropoids" and was recorded in the Skamania County Register of Ordinances, Volume 12. Whatcom County, Washington, passed a similar resolution in 1991. As of 2023, no prosecution has been brought under either ordinance.